City Council is giving Winchester's Human Resources Department an extra month to address concerns raised by career firefighters and paramedics over proposed changes to the city's vacation and sick leave policies. "This is one of those issues ... that could be a game changer for us," Winchester Fire and Rescue Chief William Garrett told council at its meeting Tuesday night. Winchester Human Resources Director Paula Nofsinger has proposed the following modifications to the current Comprehensive Employee Management System, which was implemented in 1979: Rebrand the city's vacation and sick leave programs as paid time off (PTO). Convert the city's sick leave bank, which gives employees the option of setting aside a certain number of vacation or sick days per year in case of a serious medical condition, to medical leave.